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Highlights: [•] MIL-53(Al) reacts with water under reflux yielding H2BDC and γ-AlO(OH). [•] Maximum reaction degree is 20%. [•] H2BDC molecules are occluded in the pores. [•] Sheets of γ-AlO(OH) form a shell around the particles. [•] Reflux in water can be used to modify the surface chemistry of MIL-53(Al). [ABSTRACT FROM AUTHOR]

This work focuses on different ways to improve the yield and/or the crystalline quality of EMT/FAU-type zeolite nanocrystal aggregates obtained in the presence of organic additive triethanolamine (TEA). The increase of the amount of aluminum reagent enhances the synthesis yield by a factor of 2.5 without affecting the crystallization rate and the microporous volume. On the other hand, the increase of the thermal treatment time allows to increase the synthesis yield, the crystallization rate and the microporous volume. Furthermore, addition of EMT zeolite seeds into the starting reaction medium improves the crystallization rate and the microporous volume. [ABSTRACT FROM AUTHOR]